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Choosing a Replacement Upvc Door Handle The best choice for a replacement upvc door handle involves checking that it matches the measurements of your door's PZ and screw fix centres. These are typically located on the backplate of your handle. The majority of handles have spring cassettes that help keep the lever of the handle in the horizontal position. If your handles from upvc are floppy when open this could be due to the fact that the spring is degrading. Inline Lever/Lever